Testosterone, the key hormone for muscle building and libido, plays a crucial role in various bodily functions. Low testosterone levels, also commonly known as low T, can have significant health consequences that extend beyond the gym and the bedroom. Here are five signs that your testosterone may be too low: 1. Decreased Libido. One of the most common signs is a drop in libido. Men with low T often experience a lack of sexual drive. 2. Muscle Loss. When testosterone levels decrease, your body may shift to a catabolic state, breaking down muscle tissue instead of building it up. 3. Brain Fog. Inadequate hormone levels may hinder optimal brain cell function, resulting in cognitive challenges with thinking and memory. 4. Hair Loss. Testosterone is vital for the growth of facial and body hair; those with low T may experience hair thinning and loss, and not just on the scalp. 5. Fatigue and Low Energy. You may feel unmotivated, find your usual activities more tiring, and experience slower recovery from physical exertion.